selector

selector
noun
  1. a person or thing that selects something, in particular
    挑选人,选择者,尤指
    ■a person appointed to select a representative team in a sport
    (体育代表队的)选拔人
    ■a device for selecting a particular gear or other setting of a machine or device
    选择器,选择开关,选择装置
    ■(亦作 selecta)(Brit. informal)a disc jockey (especially in the context of reggae and UK garage music)
    (英,非正式)(尤指雷盖音乐和英国车库音乐中的)流行音乐节目主持人
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